'Seal' in the Bible

He that hath received his witness hath set his seal to this , that God is true.

and he received the sign of circumcision, a seal of the righteousness of the faith which he had while he was in uncircumcision; that he might be the father of all them that believe, though they be in uncircumcision, that righteousness might be reckoned unto them;

If to others I am not an apostle, yet at least I am to you; for the seal of mine apostleship are ye in the Lord.

Howbeit the firm foundation of God standeth, having this seal, The Lord knoweth them that are his: and, Let every one that nameth the name of the Lord depart from unrighteousness.

And when he opened the second seal, I heard the second living creature saying, Come.

And when he opened the first seal, I heard the third living creature saying, Come. And I saw, and behold, a black horse; and he that sat thereon had a balance in his hand.

And when he opened the fourth seal, I heard the voice of the fourth living creature saying, Come.

And when he opened the fifth seal, I saw underneath the altar the souls of them that had been slain for the word of God, and for the testimony which they held:

And I saw when he opened the sixth seal, and there was a great earthquake; and the sun became black as sackcloth of hair, and the whole moon became as blood;

And I saw another angel ascend from the sunrising, having the seal of the living God: and he cried with a great voice to the four angels to whom it was given to hurt the earth and the sea,

And when he opened the seventh seal, there followed a silence in heaven about the space of half an hour.

And it was said unto them that they should not hurt the grass of the earth, neither any green thing, neither any tree, but only such men as have not the seal of God on their foreheads.

And when the seven thunders uttered their voices , I was about to write: and I heard a voice from heaven saying, Seal up the things which the seven thunders uttered, and write them not.

And he saith unto me, Seal not up the words of the prophecy of this book; for the time is at hand.